William n



(No Model.)

W. N. RUMELY.

STEAM BOILBR.

No. 389,250. Patented Sept. 11, 1888.

N. PETERS. Phenrumognpmr. washingwn. D. C

IlNiTnnG STATES ATnNT Fries.

VILLIAM N. RUMELY, GF LA PORTE, INDIANA, ASSIGNOR TO IIIMSELF ANDMEINRAD RUMELY, OF SAME PLACE.

STEAM-BOlLER.

SPECIFICATION forming part of Letters Patent No. 389,250, datedSeptember 1l, 1888.

Application filed Septembl r 6, 18H6. Serial No. 212,703.

To @ZZ whom, it muy concern: Be it known thatLWrLrmM N. RUMELY, acitizen of the United States, residing at La Porte, in the county of LaPorte and State of g Indiana, have invented a new and useful Improvementin Steam-Boilers, of which the following is a specification.

My invention relates to steam-boilers of that class which have a largemain due with small Io return-lines and the ordinary locomotive form ofEre-box at one end anda combustion-chamber at the other. The principledifculty eX- perienced in the practical use of this class ol' boilersheretofore has been in the burning` out ofthe upper wall of thecombustion-chamber, the combustion-ehamber usually being made large andextending up to or almost up to the o outer shell of the boiler, asindicated, for example, in the patent to Porter, No. 325,967,0'f 2oSeptember 8, 1885. I have found by experiment that in such boilers muchbetter heating and steam-generating results may be produced byelongating the combustion-chamber and contracting it diametrically, sothat its upper wall or crown-sheet will come below the waterline, and atthe same time the crown-sheet, being submerged, is prevented by the samemeans from burning out. The crown-sheet is made flat br about tlat, sothat its central por- 3o tion will not be so elevated nor so liable tobe exposed or left dry as it would be if curved when such boilers areused on road-engines that frequently have to run on inclined roads. Thecrown-sheet of the combustion-chamber is also submerged.

In the accompanying drawings, which form a part of this specification,and in which similarlettersor" reference indicate like parts, Figure lis a central longitudinal section of a 4o steam-boiler embodying myinvention, and Figs. 2 and 8 are cross-sections on lines 2 2 and 8 3 ofFig. l.

In said drawings, A represents the outer shell of the boiler, and A isthe depressed leg surrounding or partially surrounding the iirebox B.

B is the grate; B, the ash-pit below the grate, and B3 the door throughwhich the fuel is fed to the lirebox. y

C is the main flue, leading from the upper (No model.)

part ofthe lire-box B to the combustion-chamber D. This main flue issurrounded by the water on all sides.

E Eare the small return-dues leading from the combustion-chamber D tothe smoke box or stack F.

D is the crown sheet of the combustionchamber,whieh is preferably aboutstraight or llat in cross-section, as indicated in Fig. 2,and issubmerged or arranged below the Water-line, as indicated in Figs. l and2.V By thus depressing the crown-sheet D the capacity of thecombustion-chamber is somewhat diminished, and to compensate for this inpart I somewhat increase the length of the combustion-chamber. Thecrown-sheet and wall of the combustion-chamber are connected to the mainflue through the due-sheet d, and at its outer end it is riveteddirectly to the head A? ofthe boiler or tlange thereon.

D`j is the head-plate of the boiler, which closes the end of thecombustion-chamber. rIhis head-plate has a separate door or opening, Df.The upper wall or crown-sheet, b, of the fire-box may be made eitherAtlat or slightly curved, but preferably slightly curved, as indicatedin Fig. 3.

As the crownsheets ot' the tire-box and combustion-chamber are botharranged below the Water-line, and as the erownsheet receives a verygreat heat, the total heating or steamgenerating capacity of the boileris largely increased by this construction ofthe combustionehamber, andat the same time the crownsheet ofthe combustion-chamber is preventedfrom burning out. rIhe lower wall, d', of the combustion-chamber isslightly inclined upward to give greater room for the hand-hole c forcleaning out the boiler. The end or head plate, D2, is secured in placeor to the head A2 of the boiler by bolts a.

In practicing my invention two main dues may be employed in place ofone, and I do not limit myself to a single main flue.

I hereby disclaim the steam-boilers shown and described in Patent No.192,48l,to Barber and Porter, of June 26, 1877; in Patent No.226,443,150 Cowhig,of April 13, 1880; in Patent No. 233,102, to Kern,ofOctobcr12, 1880, and in Patent No. 225,722, to Rivet, of March 23,1880.

lOO

l I elaimv 1. The combination, in a steam -boiler, of

youter shell, A, having a depressed leg, A,with

a locomotive form of lire-box B, surrounded by said leg, main due C,combustion-chamber D, having crown-sheet D depressed below thewater-line and riveted to the outer head, A2, of said boiler, thewater-space of said boiler extending from one end of said shell to theother and continuously over bot-h the crownsheet of said flrebox and thecrownsheet of said combustion-chamber, return-lines E, and smoke box orstack F, said smokebox or stack being at the lire-box end of saidboiler, and said return-fines leading directly from saidcombustion-chamber to said smoke box or stack, substantially asspecified.

2. The combination, in a steam-boiler, of a depressed or locomotive formoflire-box at one end of the boiler, a smoke box or stack, F. at thesame end of the boiler and above said firebox, an elongatedcombustion-chamber, D, at

the opposite end of the boiler, having a at crown-sheet, D', depressedbelow the water line and riveted directly to the outerhead,A2, z5 of theboiler, main Hue C, leading directly from said combustion-chamber tosaid smoke box or stack F, head-plate D2, and door D, substantially asspecified.

8. In a steam-boiler, the eombustioncham ber D, formed of theoutwardly-flanged fluesheet d, terminating at its top below thewaterline of the boiler, the headblock A2 of the boiler, having anoutwardly-ifianged opening of smaller circumference than saidline-sheet, and the shell and crown-sheet of said combustion-chamber,riveted to the iianges of said flue sheet and head A2, substantially asspecitied.

\VM. N. RUMELY.

lVitnesses:

ALLAN HAINE, W. D. BUTTERFIELD.

